Canon PowerShot A580 2463B020 User Guide (en)

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[Face Detect] cannot be used when the LCD monitor is 
turned off.
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The AF frame appears as follows when the shutter button is 
pressed halfway.
- Green
: In focus
- Yellow
: Focusing difficulty ([Center] option)
- No AF frame : Focusing difficulty ([Face Detect] or [AiAF] 
option)
Face Detect Feature
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Maximum of three AF frames will be displayed at the positions of 
faces the camera recognizes. At this point, the frame the camera 
judges to be the main subject appears in white while the others 
appear in gray. When the shutter button is pressed halfway and 
the camera focuses, up to 9 green AF frames may appear.
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The camera will shoot using [AiAF] not the [Face Detect] function if 
a white frame fails to appear and only gray frames display, or if a 
face is not detected.
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The camera may mistakenly identify non-human subjects as a 
face.
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In certain cases, faces may not be detected.
Examples:
- If faces are at the edge of the screen, or appear extremely small, 
large, dark or bright, relative to the overall composition.
- Faces turned to the side or at a diagonal, or faces with a portion 
hidden.